Parallel picker-stick motion



June 26, 1928.v 1,674,809

E. E. TALBOT L PARALLEL PICKER STICK MOTION Filed u; 16, 1927 fiaventar ,IM/mt June 26, 1928.

Filed May 16, 1927 2 Sheets-Sheet 2 JiIlbd Patented June 26, 1928.

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EVABISTE E. TALBOT, OF FALL RIVER, MASSACHUSETTS.

PARALLEL PICKER-STICK MOTION.

Application filed May 16,

otherwould describe an arc of acircle in p which it would occupy a higher position at the center of its movement than at its ends,

thereby resulting in an unsatisfactory pick. I

The ordinary parallel motion consists of a relatively stationary bearing face and a curved rocker to which the picker stick is fastened and which in turn rests upon the flat bearing face of the shoe, being held in position by a projection on the shoe disposed ina slot cut in the rocker, thereby to allow the rocker to move freely as the picker stick swings back and forth. The curve of the rocker is such that it forms the arc of a circle having the picker as its center and a radius equal to the distance between the picker and the shoe, so that as the picker stick swings back and forth on the rocker as a fulcrum, its upper end or picker, is theoretically at least always maintained at the same level throughout its entire throw.

As a practical matter, however, the socalled parallel motion does not secure true parallel motion of the picker stick at all points in its throw, due to a variety of factors which have long been recognized by loom builders.

According to my analysis of the problem, the difiiculty with the ordinary rocker type parallel motion is that it has itself an arcual motion which must be synchronized with the arcual motion of the picker stick. I have deliberately departed from the rocker type parallel motion in my solution of the problem and instead I have interposed a novel compensating connection between the picker stick and the drive therefor effective to cause the picker end of the stick to move in a truly horizontal plane at all points in its travel. My motion translating device is positive and reliable and results in a picker stick motion which may be described as truly parallel.

In the accompanying drawings I have shown an embodiment of my invention which I have found satisfactory under actual con ditions of use. In these drawings:

Figs. 1 and 2 are fragmentary elevations at the front of a loom of standard type equipped with a parallel motion in accordshoe having a level' 1927. Serial No. 191,605.

ance with my invention, and showing the position of the parts when the picker stick is at either limit of its throw.

Fig. 3 is a detail view of my novel motion translating device removed.

Fig.4 is a view similar to Fig. 3 but showing the device in an opposite position of op eratlon.

Fig. 5 is a detail view of the spring box.

, Fig. 6 is a section on the lines 66 of Figs. 4 or 5, and 3 Fig. 7 is a view showing diagrammatically the truly parallel motion of the picker stick.

Although applicable to a variety of looms,

I have shown my invention in these drawings as applied to a Northrop loom of the cone pick type drive for the picker stick. It will be understood, however, that this showing is purely illustrative and in no way limiting and that my device may be. applied with little or no modification to various other looms of standard type and standard picker stick drive.

In, Figs. 1 and 2, I have illustrated sufficient of the picking motion of a cone pick type drive to make clear the construction and operation of my parallel motion. In these figures the numeral 1 indicates a part of the loom frame. The picking cam is indicated at 2, the cam shaft at 3, the cone on which the cam acts at 4 and the picking shaft at- 5. Fastened to the opposite end of the picking shaft is the picking shaft arm 6, which carries a collar 7, to which is fastened a short lug strap 8, which is connected by the lug stick 9 with another lug strap 10, fastened to the picker stick 11.

This picking motion is standard and forms no part of my invention.

In accordance with general practice, I position at the foot of the picker stick my parallel motion, which generally considered consists of the attachment detailed in Figs. 3 and 4. Such attachment comprises a relatively fixed plate or casting 12 which is sleeved about one end of the usual rocker shaft 13 for the lay of the loom, as indicated at 14. The casting 1-2 is provided with an offset bearing 15 which is substantially vertically slotted, as indicated at 16, to receive a pivot stud 17 adjustably held therein in any suitable manner.

Mounted on the stud 17 and slotted as at 18 to receive the stud is a strap 19 to which the picker stick is fastened, as indicated at mounted on ashouldered stud 23 between dotted and full line showing.

spirit and scope of my invention,

the casting 12 and strap 19. Within the spring box and anchored to the stud 21 is the usual return spring 24 for moving the picker stick on its return motion.

In operation, the cone drive moves the picker stick in the direction indicated by the arrow A in Fig. 3 and the spring 24; returns the picker stick in thedirection indicated bythe arrow B. During the travel of the picker stick, however the crank 21, 2:2, swings from the position shown in Fig. 1 to that shown in Fig. 2, so as to maintain the picker at the same horizontal level throughout its entire throw. This motion is in the natureof an eccentric motionand is indicated diagrammatically in Fig. 7 by the Its effect is to cause the picker to travel in a substantially straight line throughout its entire throw, as seen in Fig. '7.

Various modifications in the construction and operation of my device may obviously be resorted to without departing from the ii within the limits of the appended claims.

vlVhat 1 therefore claim and desire to. secure by Letters Patent is: i1.,1n a parallel picker stick motion, in combination with the usual picker stick drive, a relatively stationary casting mounted adjacentthe 00b of the picker stick, a

crank carried by said casting, and a picker stick fastening member pivotally and slid ably mounted on said casting and operatively connected with said crank for causing the out its entire throw.

picker end of the stick to travel in a straight line throughout its entire throw.

2. In a parallel picker stick motion, in combination, with the usual picker stick drive, a relatively stationary casting mounted adjacent the foot of the picker stick, said casting being substantially vertically slotted and having a crank, and a picker stick strap pivotally and slidably mounted in the slot of said casting and operatively connected with said crank tocause the picker end of the stick to travel in a straight linethrough- 3. In a parallel picker stick motion, in combination with the usual picker stick drive, a relatively stationarycasting mounted adjacent the foot ofthe picker stick,a shouldered'stud carried by said casting, 'a

,spring box rotatably mounted on said stud and containing a ratchet and a return spring, and a picker stick strap pivotally and slidably connected between its ends to said casting and having a stud disposed between adjacent teeth of said ratchet and to which stud said return spring is anchored.

a. In a parallel pickerstick motioin in,

combination with the usual picker stick drive, a relatively stationary casting mounted adjacent the foot of the picker stick, said -asting "being substantially vertically slotted, a shouldered stud carried by said casting, a spring box rotatably mounted on said stud and containing a ratchet and a return spring, and a picker stick strap pivotally and slidably mounted in the slot. oi said casting and having a. stud disposed between adjacent teeth of said ratchet and to which stud said return spring is anchored.

In testimony whereof I aliiX mysignature.

EVARISTE E. TALBOT. 

